package com.nowcoder.community.controller;

import com.google.code.kaptcha.Producer;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author xiexu
 * @create 2022-06-03 12:10
 */
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private RedisTemplate redisTemplate;

    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage() {
        // 跳转到注册页面
        return "/site/register";
    }

    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage() {
        // 跳转到登录页面
        return "/site/login";
    }

    /**
     * 注意一个问题：在springmvc中，只要调用这个方法，那么参数user就会自动保存到model里面
     *
     * @param model
     * @param user
     * @return
     */
    @RequestMapping(path = "/register", method = RequestMethod.POST)
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        // 如果map为空说明注册成功了
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/index");
            // 跳转到操作结果页面
            return "/site/operate-result";
        } else { // 注册失败，返回错误信息并重新跳转到注册页面
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            // 跳转到注册页面
            return "/site/register";
        }
    }

    // http://localhost:8080/community/activation/101/code
    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {
        int result = userService.activation(userId, code);
        if (result == ACTIVATION_SUCCESS) { // 激活成功
            model.addAttribute("msg", "激活成功，您的账号已经可以正常使用了！");
            model.addAttribute("target", "/login"); // 跳转到登录页面
        } else if (result == ACTIVATION_REPEAT) { // 重复激活
            model.addAttribute("msg", "无效操作，该账号已经激活过了！");
            model.addAttribute("target", "/index"); // 跳转到首页
        } else { // 激活失败
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/index"); // 跳转到首页
        }
        // 跳转到操作结果页面
        return "/site/operate-result";
    }

    // 生成验证码的方法
    @RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response /*, HttpSession session*/) { // 因为验证码属于敏感数据，所以存在session比较合适
        // 生成验证码文本
        String text = kaptchaProducer.createText();
        // 通过验证码文本生成验证码图片
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        //session.setAttribute("kaptcha", text); 替换成下面的redis

        // 验证码的归属者
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60); // cookie失效时间为60秒
        cookie.setPath(contextPath); // cookie在整个路径范围都有效
        response.addCookie(cookie);
        // 将验证码存入redis
        String redKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redKey, text, 60, TimeUnit.SECONDS); // 验证码过期时间60s

        // 将验证码图片输出给浏览器
        response.setContentType("image/png"); // 设置传输的格式
        try {
            OutputStream os = response.getOutputStream(); // 获取输出字节流
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败：" + e.getMessage());
        }
    }

    // 登录
    @RequestMapping(path = "/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme, Model model, /* HttpSession session, */ HttpServletResponse response, @CookieValue("kaptchaOwner") String kaptchaOwner) {

        // 检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha"); 替换成下面的redis
        String kaptcha = null;
        if (StringUtils.isNoneBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }

        // equalsIgnoreCase表示验证码忽略大小写
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确！");
            // 跳转到登录页面
            return "/site/login";
        }

        // 检查账号和密码
        int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if (map.containsKey("ticket")) {
            // cookie的key和value都必须是字符串类型
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            // 设置cookie在什么范围内有效，这里设置整个项目的访问路径都有效
            cookie.setPath(contextPath);
            // 设置cookie有效时间
            cookie.setMaxAge(expiredSeconds);
            // 发送cookie到浏览器
            response.addCookie(cookie);

            // 拿到ticket，说明登录成功，重定向到首页
            return "redirect:/index";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));

            // 登录失败，跳转到登录页面
            return "/site/login";
        }
    }

    // 退出登录
    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logOut(@CookieValue("ticket") String ticket) {
        userService.loginOut(ticket);
        // 清除Security权限
        SecurityContextHolder.clearContext();
        // 重定向到登录页面，我们有两个/login请求，重定向默认就是GET请求
        return "redirect:/login";
    }

}
